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W values and Fano factors for electrons in rare gases and rare gas mixtures

The present status of both experimental and theoretical values of the mean energy required to form an ion pair (W value) and the Fano factor (F) for electrons and photons in pure rare gases (He, Ne, Ar, Kr, Xe) and their mixtures is reviewed. A good correlation between the F and the W/I ratio (I is the ionization potential) is found for rare gases except xenon. Xenon has exceptionally low F value for relatively high W/I ratio. Also, a good correlation between the Fano factor and the total inelastic to total ionization cross section is obtained for all rare gases. The electron W and F values are also compared with the corresponding values measured for alpha particles. Binary mixtures of rare gases with the metastable and with the non-metastable Penning effects are discussed.

W value; Fano factor; rare gases; gas mixtures

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